Calculate modified average based on criteria from other column

I would like to do the following:

For the value in D1, check C1. In this case, C1 = 2. Then, take the average of all values in column B that have the same value in column C, but excluding the value in row 1. So, for D1 this would be the average of B2, B4, B5, etc., but excluding B1. I have attached a sample workbook. How should I go about this?

Wouldn't a basic SUMIF/COUNTIF suffice (with adjustment to exclude current record)

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edit: I have added a MAX to ensure 0 rather than #DIV/0! where only one record exists.